Scroll compressor with differential pressure hole and communication hole

Abstract

A scroll compressor is provided that includes an oil recollecting pump to recollect oil discharged from a shell, thus to effectively recollect oil discharged out of the compressor, and a differential pressure hole formed at a position where it communicates with compression chambers after a suction completion timing, such that oil stored in an inner space of the shell can be supplied into the compression chambers using a pressure difference between a high-pressure inner space of the shell and a low-pressure compression chambers, resulting in allowing oil to be smoothly supplied to a compression unit even during low-speed driving of the compressor and preventing an occurrence of a suction loss due to oil.

Description

TECHNICAL FIELD[0001]The present disclosure relates to a scroll compressor capable of supplying oil within a shell into compression chambers using differential pressure.BACKGROUND ART[0002]A refrigerant compression type refrigeration cycle includes a compressor, a condenser, an expansion apparatus and an evaporator which are connected by a refrigerant pipe of a closed curve, and a refrigerant compressed in the compressor then circulates sequentially via the condenser, the expansion apparatus and the evaporator.[0003]The compressor requires a predetermined amount of oil for lubrication of a driving unit, sealing and cooling of a compression unit, and the like. Therefore, a predetermined amount of oil has to be stored in a shell of the compressor. However, such oil is partially discharged from the compressor in a mixed state with a refrigerant, and then circulates together with the refrigerant via the condenser, the expansion apparatus and the evaporator. Here, if an excessive amount ...

AI Technical Summary

Benefits of technology

Effectively recollects oil and supplies it to the compression unit using pressure differences, enhancing compressor reliability and preventing refrigerant intake loss, even during low-speed driving.

Problems solved by technology

Here, if an excessive amount of oil circulates in the refrigeration cycle or a large amount of oil remains in the refrigeration cycle without being recollected into the compressor, oil deficiency inside the compressor is caused.

This may lower reliability of the compressor and the refrigeration cycle may have a lowered heat exchange performance.

However, in the previously filed “compressor”, the oil pump is installed at a lower end of a crankshaft, which causes a pumping force to be deficient during low-speed driving of the compressor, which might have a problem of lowering reliability of the compressor.

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